Basis: Certvia dev@a48c5fb als Fundament für Craftvia

Unveränderter Stand von certvia/dev (a48c5fb) plus Craftvia-Spezifikation
und Brandbook unter docs/craftvia/. ISMS-Module werden im Folgecommit entfernt.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/server/backup/index.ts

@@ -0,0 +1,26 @@
+// Öffentliche API der Backup-/Restore-Engine (Schicht B, mandanten-scoped).
+export {
+  buildTenantTopology,
+  assertTopologyMatchesDatabase,
+  TENANT_MODELS,
+  JOIN_MODELS,
+  type TenantTopology,
+  type TableNode,
+} from "./topology";
+export {
+  exportTenant,
+  loadArtifact,
+  listSnapshots,
+  tenantBackupPrefix,
+  type ExportOptions,
+  type ExportResult,
+} from "./export";
+export {
+  restoreTenant,
+  type RestoreSource,
+  type RestoreOptions,
+  type RestoreResult,
+  type StubIdentity,
+} from "./restore";
+export { sealArtifact, openArtifact } from "./crypto";
+export type { BackupManifest } from "./serialization";